Effect of grain size of polycrystalline diamond on its heat spreading properties

The exceptionally high thermal conductivity of polycrystalline diamond (>2000 W m−1 K−1) makes it a very attractive material for optimizing the thermal management of high-power devices. In this paper, the thermal conductivity of a diamond sample capturing grain size evolution from nucleation towa...

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Published in:Applied physics express 2016-06, Vol.9 (6), p.61302
Main Authors: Simon, Roland B., Anaya, Julian, Faili, Firooz, Balmer, Richard, Williams, Gruffudd T., Twitchen, Daniel J., Kuball, Martin
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cited_by cdi_FETCH-LOGICAL-c408t-c9bfe7a67ed657df4ef53feea0ca96bbcf4815611d1d83e22a2552a5db639e393
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container_title Applied physics express
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description The exceptionally high thermal conductivity of polycrystalline diamond (>2000 W m−1 K−1) makes it a very attractive material for optimizing the thermal management of high-power devices. In this paper, the thermal conductivity of a diamond sample capturing grain size evolution from nucleation towards the growth surface is studied using an optimized 3ω technique. The thermal conductivity is found to decrease with decreasing grain size, which is in good agreement with theory. These results clearly reveal the minimum film thickness and polishing thickness from nucleation needed to achieve single-crystal diamond performance, and thus enable production of an optimal polycrystalline diamond for heat-spreading applications.
doi_str_mv 10.7567/APEX.9.061302
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title Effect of grain size of polycrystalline diamond on its heat spreading properties
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